Eyeglasses



(No Model.) I 2 Sheets-Sheet 1.

H. E.- KIRSTEIN. EYEGLASSES.

No. 527,611. Patented Oct. 16,1894.

WITNESSES:

' INVENTORZ *Jm ifl (No Model.) 7 2 SheeEs-Shet 2.

H. E. KIRSTEIN.

EYEGLASSES.

No. 527,611. Patented Oot. 16, 1894.

ZZGJ.

WITNESS 67 INVENTOR (,2. 9%. W W* tageous conditions.

UNITED STATES PATENT OFFICE.

HENRY E. KIRSTEIN, 0E RooHEsTER, NEW YORK.

EYEGLASSES.

SPECIFICATION forming part of Letters Patent No. 527,611, dated October16, 1894.

Application filed December 24,1892. Serial No. 456,206- (No model.)

To aZZ whom, it may concern.-

Be it known that I, HENRY E. KIRSTEIN, a citizen of the United States,residing at Rochester, in the county of Monroe, in the State of NewYork, have invented certain new and useful Improvements inEyeglasses, ofwhich the following is a specification.

In'Letters Patent of the United States No. 465,821, dated December 22,1891, is disclosed an eye glass of the class in which the connecting bowis made adjustable to allow of movement of the lenses toward and fromeach other and in which a spring, mounted upon or in connection with thebow, constantly operates to force the lenses toward each other, 7

so that, in use, the lenses or their nose pieces are held against theopposite sides of'the nose of the wearer with a pressure commensurate .asingle horizontally disposed slide pin extending through the said yokeand intermediate of said two slide pins, and provided at its freeextremity with a yoke which embraces the said two slide pins. A spiralspring is interposed between and bears against the respective yokes todraw the lenses toward each other.

While the mechanical construction thusoutlined is found in practice toconstitute a useful and practical connecting bridge, its desirability isimpaired by several disadvan-g Thus, for instance, the three pins areeach of circular cross-section, so that when assembled they involve aconj ecting edges and corners of the heads of the side bars at andabout'the junction of the side bars with thebases ofthe pinsisobjectionable because said edges add to the unsight-- In the drawingsI show and herein I de-' scribe a preferred form of a convenientembodiment of my invention, the particular subject-matter claimed asnovel being hereinafter definitely specified.

- In the drawings, Figure 1 is a view in front elevation of a pair ofeye glasses embodying my invention. Fig. 2 is a View in perspec tive ofmy improved form of bridge, from which view the spiral spring is omittedfor clearness of illustration. Fig. 3 is a transverse section of thebridge on the line wx of Fig. 2. Fig. 4 is a fragmentary view inperspective of the slide pins and yokes. Fig. 5 is a view in perspectiveofa pair of eye glasses illustrating an arrangement in which the bridgeside bars join the lens rims at the upper edges of the latter. Fig. 6 isa fragmentary view, in perspective, of a modified arrangement of slidepins. Fig. 7 is aview in transverse section of the slide pins shown inFig. 6. Figs. 8 and 9 are views in end elevation of the yokes employedin the arrangement of slide pins illustrated in Fig. 6.

Generally stated, one part of my invention comprehends the provision ofan eye glass or spectacle, the bridge or connection between the lensesof which is constituted by a pair of bridge side bars extending upwardfrom the respective clamp posts, or from any preferred portion of therims of the lenses, and by slide pins preferably formed integral withand as continuations of said side bars, and

preferably also provided with matching side stitute respectively, incross-section, segmentherein illustrated,.a a, are the clamp posts ofapair. of lenses, and B0 are the bridge IOO side bars, the lowerextremities of which side bars are in said figures shown as alfixed tothe respective clamp posts. The side bar B extends upwardly andoutwardly over the adjacent lens to a point above the latter, then turnsupon itself and extends horizontally toward the other lens, to form aslide pin b.

The side bar 0 extends upwardly and out-t wardly over its adjacent lensto a point above the latter, then turns upon itself and extendshorizontally towardthe other lens to form two parallel slide pins 0.

The side bars B G are conveniently, although not restrictively, formedof round wires which, while preferably quite thin at their lowerportions, may at their upper portions be of increased diameter so as tobe at their bends of a diameter about qual to the aggregate diameters ofthe slide pins. The slide pin 6 on the one hand and the slide pins 0 onthe other, are of such cross-section as to be adapted to nest snugly andclosely together to complete the cylindric or other preferredsymmetrical bar which they collectively constitute.

In the first four figures of the drawings I illustrate the two pins 0 asbeing each of segmental cross-section, with flat interior faces opposingeach other, and the pin 1) as of segmental cross-section having flatexterior sides and being of such dimensions as to fit snugly between thepins 0 and complete the cylindric bar of which the pins 0 constituteoppositely disposed outside portions. As a matter of fact, the pins 0are most conveniently formed by cutting a longitudinal slotof theappropriate dimensions through the center of the horizontal portion ofthe side bar 0 from its free end in to a point near its curve,while thepin b is conveniently formed by cutting away the j opposite sides of thehorizontal portion of the round bar which constitutes the side bar B Ifrom its free end to a point in the vicinity of its bend.

The free extremity of the pin 1) is equipped with a yoke b", whichembodies two segmental openings through which the pins 0 extend, and, inthe operation of the glasses, slide.

The free extremities of the pins 0 are provided with a yoke e embodyingan opening through which the pin 1) extends, and, in the operation ofthe glasses, slides. Theseyokes b c are preferably of circular form soas to match the configuration of the assembled course operate to drawthe lenses together, a

movement which is only limited by the length of the slide pins or thecontact of the nose pieces with the noseof the wearer.

E E are nose pieces of any desired character, shown in the drawings asmounted upon the clamp posts.

As will be understood, the formation of the pins as integralcontinuations of the respective side bars obviates the necessity forjoints or projecting corners; and the formation of the several pins assegmental or other sub-divisions of a single cylindric or other,symmetrical bar reduces the dimensions of said pins to a minimum andobviates the excessive size of the completed structure resultant from aconstruction in which each pin is itself a cylindric or other barindependent of and not matching with the other bars.

The bridge side bars-referredto in this specification are thedeviceswhich constitute the connection between the slide pins on the onehand and the lenses on the other, and they may be made in any preferredform and disposed in any preferred arrangement, vertical, horizontal, orotherwise.

In Fig. 5 of the drawings I illustrate an embodiment of my invention inwhich the bridge side bars are arranged in a practically horizontaldisposition, being connected to the respective lens rims at points atthe. upper edges and preferably midway of the lengths of the latter. I i

In Figs. 6, 7, 8 and 9, I illustrate an arrangement of slide pins inwhich the pinb is of cylindric section, and in which the interior facesof the pins 0 are of concave form to snugly fit against the oppositesides of the pin 11, while the exterior circumference of the pins 0 ofcourse exceeds thatof the pin b. i

1. As an article of manufacture, apair of spectacles or eye glassesequipped with a pair of bridge side bars, one slide pin projectinghorizontally from one of said side bars, two slide pins projectinghorizontally fromthe other of said side bars, said slide pins havingmatched side faces, yokes by which said slide pins are mounted insliding engagement with each other, and a spring adapted to draw thelenses together, substantially as set forth.

2. As an article of manufacture, a pair of eye glasses or spectacles,bridge side bars, one slide pin projecting from one side bar, two slidepins projecting from the other side bar, said slide pins being of suchcross-section as to fit snugly together to form a cylindric or otherbar, yokes mounted upon said slide pins, and a spring, substantially asset forth.

3. As an article of manufacture, a pair of eye glasses or spectaclesprovided with bridge side bars, a slide pin formed as an integralcontinuation of one side bar, two slide pins formed as integralcontinuations of the other of said side bars, said slide pins being ofsuch cross-section as to fit snugly together laterally, yokes by whichsaid slide pins are mounted free for sliding engagement with each other,

and a spring tending to draw the lenses together, substantially as setforth.

4:- As an article of manufacture, a pair of IIO spectacles or eyeglasses, bridge side bars extending upwardly from the clamp posts orother convenient portion of the glasses, one of said bridge side barshaving a horizontal extension, of circular outline in cross-section,embodying, to form itinto two slide pins, a central longitudinal slot,the other of said bridge side ba rs having a horizontal extension shapedto fit snugly within the said slot, yokes mounted upon the extremitiesof the respective pins, and a spiral spring surrounding said pins andbearing against their respective yokes, substantially as set forth.

5. As an article of manufacture, a pair of spectacles or eye glasses,bridge side bars extending upwardly from the clamp posts or otherconvenient portion of the glasses, one of said bridge side bars havingan integral horizontal extension of circular outline in crosssection,embodying, to form it into two slide pins, a central longitudinal slot,the other of said bridge side bars having an integral extension shapedto snugly fit within the said slot, yokes mounted upon the extremitiesof the respective pins, and a spiral spring surrounding said pins, andbearing against their respective yokes, substantially as set forth. Intestimony that I claim the foregoing as my invention I have hereuntosigned my name this 7th day of October, A. D. 1892.

- H. E. KIRSTEIN. In presence of- F. NORMAN DIXON, R. M. RUSSELL.

